Page 1
User’s Guide
Shop online at
omega.com
e-mail: [email protected]
For latest product manuals:
www.omegamanual.info
SM
OMB-DAQ-TC-RACK
32-Channel USB/Ethernet Based
Thermocouple Input
Data Acquisition System
Page 2
omega.com [email protected]
Servicing North America:
U.S.A.: Omega Engineering, Inc., One Omega Drive, P.O. Box 4047
Stamford, CT 06907-0047 USA
Toll-Free: 1-800-826-6342 (USA & Canada only)
Customer Service: 1-800-622-2378 (USA & Canada only)
Engineering Service: 1-800-872-9436 (USA & Canada only)
Tel: (203) 359-1660 Fax: (203) 359-7700
e-mail: [email protected]
For Other Locations Visit omega.com/worldwide
The information contained in this document is believed to be correct, but OMEGA accepts no liability for any errors it contains, and reserves
the right to alter specifications without notice.
Page 3
Table of Contents
Preface
About this User's Guide ...................................................................................................................... 5
What you will learn from this user's guide .......................................................................................................... 5
Conventions in this user's guide........................................................................................................................... 5
Where to find more information .......................................................................................................................... 5
Chapter 1
Introducing the OMB-DAQ-TC-RACK................................................................................................. 6
Ethernet interface ................................................................................................................................................. 6
USB interface ....................................................................................................................................................... 6
Functional block diagram .................................................................................................................................... 7
Chapter 2
Installing the OMB-DAQ-TC-RACK..................................................................................................... 8
Unpacking ............................................................................................................................................................ 8
Installing the software.......................................................................................................................................... 8
Connecting the external power adapter ............................................................................................................... 8
Installing the hardware...............................................................
Installing on USB ................................................................................................................................................................ 8
Installing on Ethernet .......................................................................................................................................................... 8
IP address settings ............................................................................................................................................................... 9
Setting up the OMB-DAQ-TC-RACK for communication across networks .................................................... 10
Calibrating the hardware.................................................................................................................................... 10
Factory calibration............................................................................................................................................................. 10
Field calibration................................................................................................................................................................. 10
Restoring factory default network settings ........................................................................................................ 10
.......................................................................... 8
Chapter 3
Functional Details .............................................................................................................................. 11
External components.......................................................................................................................................... 11
USB connector .................................................................................................................................................................. 11
Ethernet connector............................................................................................................................................................. 11
External pow
TC input connectors, measurements, and LED ................................................................................................................. 11
Digital I/O ......................................................................................................................................................................... 13
LED indicators .................................................................................................................................................................. 14
EXPANSION connector ................................................................................................................................................... 14
Chassis ground connector.................................................................................................................................................. 14
RESET button ................................................................................................................................................................... 15
er connector.................................................................................................................................................. 11
Mechanical drawings ......................................................................................................................................... 16
Chapter 4
Specifications..................................................................................................................................... 18
Thermocouple input ........................................................................................................................................... 18
Channel configuration........................................................................................................................................ 19
Compatible thermocouple sensors ..................................................................................................................... 19
Accuracy ............................................................................................................................................................ 20
Thermocouple measurement accuracy .............................................................................................................................. 20
Digital input/output ............................................................................................................................................ 20
Temperature alarms ........................................................................................................................................... 21
Memory.............................................................................................................................................................. 21
Microcontroller .................................................................................................................................................. 22
Power ................................................................................................................................................................. 22
USB.................................................................................................................................................................... 22
Network ............................................................................................................................................................. 23
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OMB-DAQ-TC-RACK User's Guide
Ethernet connection ........................................................................................................................................................... 23
Network interface .............................................................................................................................................................. 23
Network factory default settings ....................................................................................................................................... 23
Network security ............................................................................................................................................................... 23
LED displays and the factory reset button ......................................................................................................... 24
Environment....................................................................................................................................................... 24
Mechanical ......................................................................................................................................................... 24
Signal I/O connectors......................................................................................................................................... 24
4
Page 5
About this User's Guide
What you will learn from this user's guide
This user's guide describes the Measurement Computing OMB-DAQ-TC-RACK data acquisition device and
lists device specifications.
Conventions in this user's guide
For more information
Text presented in a box signifies additional information related to the subject matter.
Shaded caution statements present information to help you avoid injuring yourself and others,
damaging your hardware, or losing your data.
bold text Bold text is used for the names of objects on a screen, such as buttons, text boxes, and check boxes.
italic text Italic text is used for the names of manuals and help topic titles, and to emphasize a word or phrase.
Where to find more information
Additional information about OMB-DAQ-TC-RACK hardware is available on our website at www.omega.com.
You can also contact Omega Engineering by phone, fax, or email with specific questions.
•
•
•
: (203) 359-1660
Phone
Fax: (203) 359-7700
Email: [email protected]
5
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Introducing the OMB-DAQ-TC-RACK
The OMB-DAQ-TC-RACK is a dual-interface data acquisition device that provides the following features:
32 differential thermocouple (TC) inputs, expandable to 64 channels with
•
OMB-DAQ-TC-RACK-EXP32 expansion device
•
Two 24-bit ADCs (one ADC per 16 inputs)
TC channels field-to-host isolation
•
•
3 S/s per update rate
•
Support for type J, K, R, S, T, N, E, and B thermocouples, software-selectable per channel
•
One integrated cold junction compensation (CJC) sensor per TC input
•
Open thermocouple detection (OTD) to detec
•
8 digital inputs, isolated from TC and host
•
32 digital outputs/alarms isolated from TC inputs and host
•
DIO connections are made to 50-pin header connector
•
USB 2.0 or 10/100 Ethernet interface
•
Powered by the included +5 V external power adapter (OMB-DAQ-TC-RACK-PS)
-
Ethernet interface
The OMB-DAQ-TC-RACK has a built-in 10/100 BASE-T auto-negotiation, high-speed communication port.
With the Ethernet interface, you can remotely access and configure your OMB-DAQ-TC-RACK from
anywhere on the network. Only on
A unique media access control (MAC) address is assigned to each device at the factory. You configure the
Ethernet connection settings through software. The network name uses the format
xxxxxx are the lower six digits of the factory-assigned MAC address.
e computer can control the OMB-DAQ-TC-RACK at a time.
1
t fault
y TC connections
TC-32-xxxxxx, where
USB interface
The OMB-DAQ-TC-RACK is a USB 2.0 full-speed device that is compatible with USB 3.0 ports. The device is
also compatible with USB 1.1 ports.
1
40-pin ribbon cable for the EXPANSION connector is included with the OMB-TC-RACK-EXP.
6
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OMB-DAQ-TC-RACK User's Guide Introducing the OMB-DAQ-TC-RACK
Functional block diagram
Device functions are illustrated in the block diagram shown here:
Figure 1. OMB-DAQ-TC-RACK functional block diagram
7
Page 8
Installing the OMB-DAQ-TC-RACK
Unpacking
As with any electronic device, you should take care while handling to avoid damage from static
electricity. Before removing the board from its packaging, ground yourself using a wrist strap or by simply
touching the computer chassis or other grounded object to eliminate any stored static charge.
Installing the software
Refer to the Software User's Guide for instructions on installing the software on the CD. This booklet is
available in PDF at www.omega.com/manuals/manualpdf/M4803.pdf.
Connecting the external power adapter
Power to the OMB-DAQ-TC-RACK is provided with the 5 V external power adapter (OMB-DAQ-TC-RACK-PS).
Connect
into an electrical outlet.
The
less than 4.0 V or more than 5.75 V, the
the adapter cord to the power connector on the OMB-DAQ-TC-RACK device, and plug the AC adapter
Power LED turns on when 5 V power is supplied to the OMB-DAQ-TC-RACK. If the voltage supply is
POWER LED does not turn on.
Refer to Figure 2 on page 11 for the location of the
Power LED.
Installing the hardware
The OMB-DAQ-TC-RACK can run on either a USB or Ethernet interface.
Installing on USB
Connect the OMB-DAQ-TC-RACK using the cable provided to a to a USB port on a computer running
Windows. Windows finds and installs the device driver automatically, and notifies you that the device is ready
to use.
Installing on Ethernet
The OMB-DAQ-TC-RACK requires a TCP/IP and UDP connection to a network or computer. Use the standard
Ethernet cable provided to connect the OMB-DAQ-TC-RACK to a 10Base-T or 100Base-TX compati
Ethernet port, hub, or switch.
When connecting the OMB-DAQ-TC-RACK for the first time, make sure that you connect to a local network
with DHCP enabled.
If you are unsure whether you have access to a local network or that DHCP is enabled on that network, you
should use a direct connection to a Windows PC.
It may take a minute or two to detect the device and assign the address. The green
lower left of the Ethernet connector turns on when there is a valid Ethernet link, and
activity is detected.
Once the OMB-DAQ-TC-RACK is physically connected to the local network or PC, you can run the software
(InstaCal for example) to establish a connection. If a connection cannot be established, make sure the device is
using the default configuration by following the instructions in the Restoring factory default network settings on
page 10.
Once a connection is established and you can communicate to the device, you can change the configuration for
other network scenarios.
Link/activity LED on the
blinks when network
ble
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OMB-DAQ-TC-RACK User's Guide Installing the OMB-DAQ-TC-RACK
Configuring network settings
The following OMB-DAQ-TC-RACK network settings are software-selectable. Only one user at a time can
connect to the OMB-DAQ-TC-RACK to configure network options on the device. For typical local networks,
the default settings are recommended.
Address mode settings
The address mode setting determines whether the default IP parameters (IPv4 address, subnet mask, and
gateway) are assigned to the OMB-DAQ-TC-RACK or an auto-addressing method is used to assign these
parameters.
DHCP
or link-local enabled (default)
If connected to a network with a DHCP server, the service automatically assigns IP addresses to the
OMB-DAQ-TC-RACK.
If the connected network does not have a DHCP server, the address stored in the default IP address is assigned
to the OMB-DAQ-TC-RACK.
If the OMB-DAQ-TC-RACK is directly connected to a Windows PC or other host that supports link-local
addressing, a link-local address is assigned to the device. A link-local address is valid only for communicati
ons
between the
OMB-DAQ-TC-RACK and the device to which it is connected
DHCP Only
Enables configuration by a DHCP server if one is available. The OMB-DAQ-TC-RACK is assigned an IP
address shortly after it is powered up and attached to the network.
Link Local Only
The OMB-DAQ-TC-RACK is assigned a link-local IP address by the Windows PC or other host that supports
link-local addressing. A link-local address is valid only for communications between the
OMB-DAQ-TC-RACK and the device to which it is connec
ted.
Static
The default
IPv4 Address is manually configured on the OMB-DAQ-TC-RACK.
IP address settings
The default settings of the following IP address are assigned to the OMB-DAQ-TC-RACK when automatic
addressing is disabled or not available (DHCP or Link Local for example)
IPv4 address – The IP address that is stored on the device. The default IPv4 address is 192.168.0.101.
•
•
Subnet mask – The Subnet mask that is stored on the OMB-DAQ-TC-RACK . The subnet mask
determines the number of bits of the IP address th
at is used for the host portion of the address vs. the
number of bits used for the network portion. The default subnet mask is 255.255.255.000
•
Gateway – The gateway IP address that is stored on the OMB-DAQ-TC-RACK. The gateway address of
the device that bridges subnets within a network. The default gateway is 192.168.0.1
Connection code
The connection code is a number between 0 (default) and 999999999. You can change this number from its
default of 0 to prevent other users from connecti
ng to and conf
iguring the device. The device remains visible to
other users on the network, but connection by another user is not allowed.
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OMB-DAQ-TC-RACK User's Guide Installing the OMB-DAQ-TC-RACK
Setting up the OMB-DAQ-TC-RACK for communication across
networks
In order to communicate with the OMB-DAQ-TC-RACK from a computer connected to a different network –
such as over the Internet – you must change the network configuration of the network router.
In the following procedure, the OMB-DAQ-TC-RACK is installed on the host LAN, the computer is installed
on the client LAN, and it is assumed that you have you have successfully connected the device to a local
network.
This procedure should only be performed by a network administrator or computer professional.
Incorrect settings can significantly disrupt a network.
1. Determine the IP address of the device. If the address was assigned by DHCP, it is recommended you
change it to a static address by setting the default address to the address assigned and setting the device
network configuration to static.
2. Configure the firewall/router to forward incoming traffic to the following p orts to the IP address assigned
to the device:
•
UDP:54211 (discovery)
•
TCP:54211 (commands)
3. On the computer connected to the client LAN, manually enter the
specify the ports that were forwarded to connect to the remote OMB-DAQ-TC-RACK.
WAN address of the host router, and
Calibrating the hardware
Factory calibration
Omega Engineering performs the initial factory calibration. Return the device to Omega Engineering when
calibration is required. The recommended calibration interval is one year.
Field calibration
The OMB-DAQ-TC-RACK supports field calibration. Calibrate the device using InstaCal whenever the
ambient temperature changes by more than ±10 °C from the last calibration.
The following items are requi
a precision voltage source
•
a voltmeter
•
Each ADC (two ADCs per device) is measured at three points and a linear correction is calculated.
When prompted, enter the voltmeter reading to a precision of three decimal places.
Omega Engineering strongly recommends that you warm up the OMB-DAQ-TC-RACK for at least 20 minutes
prior to performing field calibration.
red to perform field calibration on a OMB-DAQ-TC-RACK:
Restoring factory default network settings
To reset the network configuration settings to the factory default values, complete the following steps:
1. Use a ballpoint pen to press and hold in the
Activity LEDs blink , indicating that the settings have been restored to the factory defaults.
2. Release the button so the device continues startup with the default settings. If the button is released before
the two LEDs blink, the settings are not affected and the device starts up normally.
Reset button for at least four seconds until both the Power and
If InstaCal is open when default setting
to reflect the changes.
s are restored, click the Refresh Boards button on the InstaCal toolbar
10
Page 11
Functional Details
4
5
6
7
8
9
10
External components
OMB-DAQ-TC-RACK front panel components are shown in Figure 2.
1 TC input channels 0 through 31 (32 mini-jack connectors)
2
POWER LED
3
ACTIVITY LED
Figure 2. OMB-DAQ-TC-RACK front panel components
OMB-DAQ-TC-RACK rear panel components are shown in Figure 3.
1
2
3
4
5
RESET button
Factory
USB connector
ETHERNET connector
External power (
Power switch (
Figure 3. OMB-DAQ-TC-RACK rear panel components
EXT DC) connector
PWR)
Chassis ground connector
40-pin EXPANSION connector
Eight digital input (DIN) pull-up switches
32 digital output (DOUT) pull-up switches
50-pin DIGITAL I/O connector
USB connector
The USB connector provides USB communication.
ALARM LED
OPEN TC LED
Ethernet connector
The OMB-DAQ-TC-RACK has one 10/100 BASE-T, auto-negotiation, high-speed communication port. The
port connector is an RJ-45, eight-position connector. The Ethernet port accepts CAT-5 shielded or unshielded
twisted pair cable. The maximum communication distance without using a repeater is 100 meters.
External power connector
Connect the OMB-DAQ-TC-RACK-PS power supply to this connector. The power supply provides 5 VDC,
A power to the
2
OMB-DAQ-TC-RACK.
TC input connectors, measurements, and LED
A thermocouple consists of two dissimilar metals that are joined together at one end. When the junction of the
metals is heated or cooled, a voltage is produced that correlates to temperature.
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OMB-DAQ-TC-RACK User's Guide Functional Details
You can add another 32 differential TC input connections to mini-jack connectors labeled CH0 through CH31
(refer to Figure 2).
The device supports type J, K, S, R, B, E, T, N thermocouples.
Omega Engineering strongly recommends that you ground yourself using a wrist strap before
handling the thermocouple sensors.
Connecting TCs to common-mode voltage sources
You can connect a thermocouple to a common voltage source (AC or DC) as long as the magnitude of the
voltage is within the common mode voltage range specification of 48V (DC) or 3.5V p-p (AC).
Each applied common mode voltage must be less than or equal to the average common mode voltage ±1.4 V.
For example, in Figure 4, there are three TCs connected to three different common mode voltage sources and
two thermocouples that are not connected to anything (floa
ting).
In this example, the average common mode voltage is calculated as follows: (11.4 V+ 10 V + 8.6 V)/3 = 10 V
•
Each TC channel becomes biased to the average common mode voltage of 10 V.
•
Each common mode voltage must then be within the 10 V ±1.4 V limits or 8.6 V to 11.4 V.
Figure 4. OMB-DAQ-TC-RACK common mode voltage connections example
Cold junction compensation (CJC)
Each TC input on the OMB-DAQ-TC-RACK has a high-resolution CJC sensor. When you connect the
thermocouple sensor leads to the
sensor input channel, the dissimilar metals at the OMB-DAQ-TC-RACK
terminal blocks produce an additional thermocouple junction. This junction creates a small voltage error
component which must be removed from the overall sensor measurement using a CJC technique.
The measured voltage includes both the thermocouple voltage and the cold junction voltage. To compensate for
the additional cold junction voltage, the OMB-DAQ-TC-RACK subtracts the cold junction voltage from the
thermocouple voltage.
Increasing t
he thermocouple length
If you need to increase the length of your thermocouple, use the same type of TC wires to minimize the error
introduced by thermal EMFs.
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OMB-DAQ-TC-RACK User's Guide Functional Details
Data linearization
After the CJC correction is performed on the measurement data, an on-board microcontroller automatically
linearizes the thermocouple measurement data using National Institute of Standards and Technology (NIST)
linearization coefficients for the selected thermocouple type.
The measurement data is then output as a 32-bit floating point value in the configured format (voltage or
temperature).
Open-thermocouple detection (OTD)
The OMB-DAQ-TC-RACK is equipped with OTD for all analog input channel. With OTD, any open-circuit
condition at the TC sensor is detected by the software. An open channel is detected by the use of a pull up and
pull down resistors on the thermocouple inputs. An open thermocouple condition forces the input differential
voltage outside of the valid therm
ocouple volt
age range. The software recognizes this as an invalid reading and
flags the appropriate channel. The software continues to sample all channels when OTD is detected.
Input leakage current
With OTD enabled, 75 nA (max) of input leakage current is injected into the TC. This current can cause an
error voltage to develop across the lead resistance of the TC that is indistinguishable from the thermocouple
voltage you are measuring. You can estimate this error voltage with the following formula:
error voltage = resistance of the thermocouple
75 nA
To reduce the error, reduce the length of the TC to lower its resistance, or lower the AWG of the wire by using
a wire with a larger diameter. With open-thermocouple detection disabled, 2 nA (max) of input leakage current
is injected into the TC.
Digital I/O
The OMB-DAQ-TC-RACK provides eight digital inputs and 32 digital outputs that are electrically isolated
from the host computer and from the OMB-DAQ-TC-RACK analog circuits.
All DIO bits have internal pull-up resistors to 5 V that can be disconnecte
The recommended maximum length of the 50-pin cable used to connect the
digital I/O signal source is 1 foot.
Digital inputs
The OMB-DAQ-TC-RACK provides eight digital inputs with rates of 500 port reads or single bit reads per
second.
Digital input voltage ranges of 0 V to 15 V are permitted, with thresholds of 0.6 V (low) and 2.2 V (high).
Each digital input has a 100 k
pull-up resistor. Use the eight PULL-UP ENABLE – DIN slide switches to
enable or disable the 5 V pull-up option.
5Digital outputs/temperature alarms
Each digital output is open-drain, which can of sink up to 100 mA for direct drive applications. Each output has
a 100 k
pull-up resistor. Use the eight PULL-UP ENABLE – DOUT slide switches to enable or disable the 5 V
pull-up option.
6Optionally, you can configure each digital output as an alarm for each TC input. When an alarm is enabled, its
associated output line is driven to the appropriate state determined by the alarm options and input temperature.
You can also use the alarm outputs to control a device or application that indicates when a temperature
threshold has been exceeded.
The alarm configurations are store
d in non-vol
atile memory and loaded at power up.
Alarm settings are applied when changed and at power on. Temperatures are constantly converted on enabled
channels and processed for alarm conditions regardless of the communications connectivity.
Each available alarm mode and setting is explained below.
d with the rear panel slide switches.
DIGITAL I/O connector to the
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OMB-DAQ-TC-RACK User's Guide Functional Details
Trigger alarm when input temperature
T1; reset alarm when
Trigger alarm when input temperature is < T1 or > T2
Alarm on temperature reading only
Alarm disabled; digital output line can be used for normal
Alarm input modes
Set independent temperature thresholds T1 and T2
for each alarm.
Alarm error modes
Alarm output modes
input temperature < T2
Trigger alarm when input temperature
input temperature > T2
Alarm on temperature reading, open thermocouple, or commonmode voltage error
Alarm on open thermocouple or common-mode voltage error only
operation
Alarm enabled; active low output (output line goes low when
alarm condition is met)
Alarm enabled; active high output (output line goes high when
alarm condition is met)
Alarm output may be latched and will not clear unless explicitly
cleared by the user
T1; reset alarm when
The OMB-DAQ-TC-RACK provides three alarm indicators – the ALARM LED, the OPEN TC LED on the
front panel and, optionally, the user-configurable digital outputs associated with each channel.
Because the digital alarm outputs are user-configurable, they can be used to supply additional information
(visually, if the digital outputs are used to drive LEDs), such as the channel associated with the alarm condition
or differentiating between threshold and CMV alarms.
Pull-up configuration
By default, pull-up is enabled for all eight digital inputs and all 32 digital outputs. Slide switches on the rear of
the hous
ing can disable pull-up for each digital input bit and digital output bit.
LED indicators
The OMB-DAQ-TC-RACK has four LEDs that indicate the power, communication, alarm, and open TC status
POWER LED
2
The POWER LED turns on when you plug the power adapter into the OMB-DAQ-TC-RACK. If a Flash LED
command is sent from an application, the
ACTIVITY LED
2
The ACTIVITY LED turns on when there is a valid connection (USB or Ethernet) and blinks when a command is
sent to the OMB-DAQ-TC-RACK.
ALARM LED
The
ALARM LED turns on when an alarm condition occurs.
OPEN TC LED
The
OPEN TC LED turns on when there is an open thermocouple condition.
EXPANSION connector
Use the EXPANSION connector to connect the OMB-DAQ-TC-RACK to an OMB-TC-RACK-EXP32 expansion
device (sold separately) for applications that need additional analog/thermocouple input and digital I/O
channels. A 40-pin expansion cable is included with the OMB-DAQ-TC-RACK-EXP32.
Chassis ground connector
Provides a connection point (#6-32 screw) for chassis ground. Connect this to an external grounding source.
Power LED blinks five times.
2
Both the POWER and ACTIVITY LEDs blink in firmware upgrade mode. Refer to Updating firmware on page 10.
14
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OMB-DAQ-TC-RACK User's Guide Functional Details
If the OMB-DAQ-TC-RACK is connected by USB or by a shielded Ethernet cable to grounded equipment,
connecting to an external grounding source is not needed since the USB/shielded Ethernet connection already
grounds the OMB-DAQ-TC-RACK and a connected OMB-DAQ-TC-RACK-EXP32.
RESET button
Press and hold this button to restore the OMB-DAQ-TC-RACK to its factory default network settings. Refer to
Restoring factory default network settings on page 10
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OMB-DAQ-TC-RACK User's Guide Functional Details
Mechanical drawings
Figure 7. Enclosure dimensions - front
Figure 8. Enclosure dimensions - rear
16
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OMB-DAQ-TC-RACK User's Guide Functional Details
Figure 9. Enclosure dimensions – side
Figure 10. Circuit board dimensions
17
Page 18
Specifications
A/D converter type
Delta-Sigma
A/D resolution
24-bit
Number of channels
32
50 Hz or 60 Hz noise filtering, software-
Between any TCx channel and chassis
ground.
Software-selectable to match thermocouple
sensor type
Differential input voltage range
±78.125 mV
Absolute maximum input
±25 V (power on)
50 Hz filtering, power on
26 M
60 Hz filtering, power on
20 M
Open thermocouple detect disabled
2 nA
Open thermocouple detect enabled
75 nA
50 Hz filtering, at DC and fin=50 Hz
110 dB
60 Hz filtering at DC and fin=60 Hz
110 dB
50 Hz filtering at fin=50 Hz
80 dB typ.
60 Hz filtering at fin=60 Hz
80 dB typ.
50 Hz filtering
22 Hz
60 Hz filtering
26 Hz
Crosstalk
Between any two TCx inputs
-90 dB
Sample rate (Note 1)
3 Hz max (per channel)
TCx channel to TCx channel
±1.40 V
TCx channel relative to chassis
ground, f
in
= 60 Hz
TCx channel relative to chassis ground
±48 V DC
Input noise
50 Hz or 60 Hz filtering
510 nV rms
Gain error
50 Hz or 60 Hz filtering
0.004 % FSR
Offset error
50 Hz or 60 Hz filtering
3 µV
Thermocouple type J,K,T,E,N
0.07°C
Thermocouple type R,S
0.18°C
Thermocouple type B
0.60°C
Warm-up time
20 minutes min
Open thermocouple detect
response time
±0.20°C typ
All specifications are subject to change without notice.
Typical for 25°C unless otherwise specified.
Specifications in italic text are guaranteed by design.
Thermocouple input
Table 1. Generic analog input specifications
Parameter Condition Specification
Filtering options
Isolation
Channel configuration
voltage
Differential input impedance
Input current
Common mode rejection
Noise rejection
Input bandwidth
Common mode voltage range
(Note 2)
Between any two TCx inputs
selectable
500 VDC absolute max
±25 V (power off)
±3.5 VAC p-p
Measurement sensitivity
(Note 3)
CJC sensor accuracy 0°C to 45°C
Note 1: The enabled thermocouple inputs are continuously converted at the maximum A/D converter rate.
Note 2: When thermocouple sensors are connected to different common mode voltages, the channels with
floating thermocouples sensors will be biased to approximately the average value of the applied
common mode voltages. Each of the applied common mode voltages must then be less than or equal to
the average common mode voltage ±1.40 V or [CMV
18
applied
1 second
±0.40°C max
(CMV
average
±1.4 V)].
Page 19
OMB-DAQ-TC-RACK User's Guide Specifications
Thermocouple
J, K, S, R, B, E, T, N
32 differential channels
J: –210°C to 1200°C
K:–270°C to 1372°C
R: –50°C to 1768°C
S: –50 °C to 1768 °C
T: –270°C to 400°C
N: –270°C to 1300°C
E: –270°C to 1000°C
B: 0°C to 1820°C
Note 2: When thermocouple sensors are connected to different common mode voltages, the channels with
floating thermocouples sensors will be biased to approximately the average value of the applied
common mode voltages. Each of the applied common mode voltages must then be less than or equal to
the average common mode voltage ±1.40 V or [CMV
Note 3: Measurement sensitivity is the smallest change in temperature that can be detected.
applied
(CMV
average
±1.4 V)].
Channel configuration
Table 2. Channel configuration specification
Sensor Category Condition Specification
Note 4: Channel configuration is stored on EEPROM external to the isolated microcontroller by the firmware
whenever any item is modified. Modification is performed by commands issued from an external
application, and the configuration is made non-volatile through the use of the EEPROM.
Compatible thermocouple sensors
Table 3. Compatible sensor type specifications
Parameter Specification
Thermocouple
19
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OMB-DAQ-TC-RACK User's Guide Specifications
Number of inputs
8 channels
Configuration
Fixed input
Input voltage range
0 V to +15 V
Input type
CMOS (Schmitt trigger)
Input characteristics
100 k
pull-up resistor, 28.7 k
series resistor
Maximum input voltage range
0 V to +20 V max (power on/off, relative to IGND pins)
Pull-up configuration
All pins pulled up to +5 V via individual 100 k resistors using slide switch SW5.
Transfer rate (software paced)
500 port reads per second typ.
Input high voltage
1.3 V min, 2.2 V max
Input low voltage
1.5 V max, 0.6 V min
Schmitt trigger hysteresis
0.4 V min, 1.2 V max
Accuracy
Thermocouple measurement accuracy
Table 4. Thermocouple accuracy specifications, including CJC measurement error. All specifications are (±).
Sensor
Type
J
K
S
R
B
E
T
N
Sensor
Temperature
(°C)
–210 1.965 0.910 2.167 0.989
0 0.787 0.361 0.816 0.375
1200 0.752 0.371 1.148 0.508
–210 2.295 1.061 2.520 1.152
0 0.821 0.376 0.852 0.392
1372 1.029 0.504 1.560 0.688
–50 2.467 1.111 2.655 1.223
250 1.835 0.825 1.961 0.904
1768 0.893 0.361 1.519 0.590
–50 2.609 1.174 2.810 1.293
250 1.862 0.837 1.992 0.918
1768 0.754 0.305 1.346 0.520
250 2.450 1.090 2.707 1.254
700 0.937 0.424 1.136 0.520
1820 0.610 0.300 1.056 0.467
–200 1.754 0.811 1.933 0.880
0 0.775 0.355 0.806 0.369
1000 0.657 0.323 0.989 0.437
–200 2.005 0.923 2.207 1.005
0 0.836 0.382 0.874 0.400
400 0.544 0.255 0.659 0.297
–200 2.255 1.038 2.481 1.134
0 0.908 0.415 0.949 0.437
1300 0.718 0.357 1.157 0.510
Accuracy Error
Maximum (°C),
15°C to 35°C
Accuracy Error
Typical (°C),
15°C to 35°C
Accuracy Error
Maximum (°C),
0°C to 45°C
Accuracy Error
Typical (°C),
0°C to 45°C
Thermocouple measurement accuracy specifications include polynomial linearization, cold-junction
compensation, and system noise. The accuracy specifications assume the device is operated within its enclosure
and with the enclosure in a horizontal, upright orientation. The board should also be warmed up for the
recommended 20 minutes. If the maximum digital output load of 3.2 amps is applied, add an additional 0.30°C
to the typical and maximum accuracy specifications listed above. Errors shown do not include inh
thermocouple
error. Contact your thermocouple supplier for details on the actual thermocouple accuracy error.
erent
Digital input/output
Table 5. Digital input specifications
Parameter Specification
SW5 default positions are on (pulled up.)
20
Page 21
OMB-DAQ-TC-RACK User's Guide Specifications
Number of outputs
32 channels, shared with alarms
Configuration
Open drain output
Output characteristics
100 k pull-up, open drain (DMOS transistor)
Pull-up configuration
All pins pulled up to +5 V via individual 100 k
resistors using slide switches
SW1-SW4. The default positions for SW1-4 are on (pulled up.)
Transfer rate (software-paced)
Digital output – 500 port writes per second typ.
Output voltage range
0 V to +5 V (internal 100 k
pull-up resistors connected to +5 V by default)
0 V to +15 V max (using external pull up resistor)
Off state leakage current
0.1 µA
Sink current capability
100 mA max (continuous) per output pin
DMOS transistor on-resistance
4
Number of alarms
32, shared with digital output
Each alarm controls its associated digital output line as an alarm output. When an
are stored in non-volatile memory and loaded at power on.
Alarm when input temperature >= T1, reset alarm when input temperature < T2
Note: T1 and T2 may be independently set for each alarm.
Alarm on temperature reading only
Disabled, digital output line may be used for normal operation
user
Alarm latency (Note 6)
1 second, max
EEPROM
8,192 bytes
Table 6. Digital output specifications
Parameter Specification
(drain to source)
Note 5: Ground pins labeled IGND are isolated from AGND and chassis ground.
Temperature alarms
Table 7. Temperature alarm specifications
Parameter Specification
Alarm functionality
Alarm input modes
Alarm error modes
Alarm output modes
Note 6: Alarm settings are applied when changed and at power-on. Temperatures are constantly converted on
alarm is enabled, its associated output line is driven to the appropriate state
determined by the alarm options and input temperature. The alarm configurations
Alarm when input temperature <= T1, reset alarm when input temperature > T2
Alarm when input temperature is < T1 or > T2
Alarm on temperature reading, open thermocouple, or common-mode voltage
error
Alarm on open thermocouple or common-mode voltage error only
Enabled, active high output (output line goes high when alarm condition is met)
Enabled, active low output (output line goes low when alarm condition is met)
Alarm output may be latched and will not clear unless explicitly cleared by the
enabled channels and processed for alarm conditions regardless of the communications connectivity.
Memory
Table 8. Memory specifications
Parameter Specification
21
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OMB-DAQ-TC-RACK User's Guide Specifications
330 mA typ, 610 mA max
DAQ-TC-RACK-EXP32 connected)
+5 VDC ± 5%
(+5 VDC power supply provided)
Power switch
Rocker type
Omega Engineering p/n OMB-DAQ-
External power input voltage
4.0 V > V
ext
> 5.75 V
PWR LED = Off (power fault)
4.0 V < V
ext
< 5.75 V
PWR LED = On
Chassis ground connection
6-32 screw on rear of enclosure
Device type
USB 2.0 full speed
Device compatibility
USB 1.1, USB 2.0, USB 3.0
Connector
Standard B
Cable length
5 meters max
Power
Self-powered (no USB current consumed)
One high-performance 32-bit RISC microcontroller (communications)
Microcontroller
Table 9. Microcontroller specifications
Parameter Specification
Type
One high-performance 32-bit RISC microcontroller (measurement)
Power
Table 10. Power specifications
Parameter Conditions Specification
Supply current
External power input (Note 5)
External power supply (included)
supervisor limits
Note 7: Voltage specification applies at barrel plug power input. The power supply provided with the device
TC-RACK-PS
550 mA typ, 1000 mA max (with OMB-
+5 VDC, 10 W, 5% regulation
meets this specification at the rated total power supply current. If a different power supply is used,
small line resistances could cause significant voltage drop between the power supply and the barrel
plug input.
USB
Table 11. USB specifications
Parameter Specification
22
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OMB-DAQ-TC-RACK User's Guide Specifications
By NBNS (responds to b-node broadcasts, therefore only available on the local
subnet)
Factory default IP address
192.168.0.101
Factory default subnet mask
255.255.255.0
Factory default gateway
192.168.0.1
Factory default DHCP setting
DHCP + link-local enabled
TCP sockets are not opened unless application sends the correct PIN code (stored
in non-volatile memory, may be changed by user, default value 0000)
Number of concurrent sessions
1
Vulnerabilities
TCP Sequence Number Approximation Vulnerability
100 Base-TX
10 Base-T
Communication rates
10/100 Mbps, auto-negotiated
Connector
RJ-45, 8 position
Cable length
100 meters max
Additional parameters
HP Auto-MDIX support
Protocols used
TCP/IP (IPv4 only), UDP
UDP:54211 (discovery)
Network IP configuration
DHCP + link-local, DHCP, static, link-local
, where
are the lower 6 digits of the device MAC
Network
Ethernet connection
Table 12. Ethernet connection specifications
Parameter Specification
Ethernet type
Network interface
Table 13. Factory default specifications
Parameter Specification
Network ports used
Network name
Network name publication
TCP:54211 (commands)
TC-32-xxxxxx
address
Network factory default settings
Table 14. Factory default specifications
Parameter Specification
Network security
Table 15. Factory default specifications
Parameter Specification
Security implementation
xxxxxx
23
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OMB-DAQ-TC-RACK User's Guide Specifications
Indicates power on. Blinks when blink command is sent. Both the
and
LEDs blink in firmware upgrade mode.
On when there is a valid connection and blinks when a command is sent to the
firmware upgrade mode.
LED
Indicates that an alarm condition is met.
LED (bottom)
Indicates that there is an open thermocouple condition.
When held for 3 seconds, the LEDs turn off for a short time, indicating a reset is in
network settings are restored.
Operating temperature range
0°C to 45°C
Storage temperature range
–40°C to 85°C
Humidity
0°C to 90% non-condensing
Dimensions (L
W
H)
482.6
128.6
43.18 mm (19 6.15
1.74 in.)
User accessible I/O connectors
Thermocouple connector type
Thermocouple Mini-Jack (Omega PCC-SMP-V-U-100)
Digital I/O connector type
50-pin IDC header
Compatible cable for the 50-pin
DIO connector
C50FF-2, C50FF-15
Compatible accessory products
CIO-MINI50
Expansion connector type
40-pin IDC header
Compatible cables for the 40-pin
C40FF-2
Chassis ground connector
6-32 screw
LED displays and the factory reset button
Table 16. LED and button configurations
Parameter Specification
POWER LED (top)
ACTIVITY
POWER
ACTIVITY LED
ALARM
OPEN TC
Factory reset button
OMB-DAQ-TC-RACK. Both the POWER and ACTIVITY LEDs blink in
process. When the LEDs turn back on, reset is complete and the factory -default
Environment
Table 17. Environmental specifications
Parameter Specification
Mechanical
Table 18. Mechanical specifications
Parameter Specification
Signal I/O connectors
Table 19. Connector specifications
Parameter Specification
(excluding USB and Ethernet)
with the C50FF-2 and C50FF-15
cables
expansion connector
Thermocouple inputs, digital I/O connector, expansion connector, chassis ground
24
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OMB-DAQ-TC-RACK User's Guide Specifications
Table 20. Thermocouple connector pinout
Pin Signal Name Pin Description Pin Signal Name Pin Description
TC0(+) CH0 sensor input (+)
J1
TC0(-) CH0 sensor input (–) TC16(-) CH16 sensor input (–)
TC1(+) CH1 sensor input (+)
J2
TC1(-) CH1 sensor input (–) TC17(-) CH17 sensor input (–)
TC2(+) CH2 sensor input (+)
J3
TC2(-) CH2 sensor input (–) TC18(-) CH18 sensor input (–)
TC3(+) CH3 sensor input (+)
J4
TC3(-) CH3 sensor input (–) TC19(-) CH19 sensor input (–)
TC4(+) CH4 sensor input (+)
J5
TC4(-) CH4 sensor input (–) TC20(-) CH20 sensor input (–)
TC5(+) CH5 sensor input (+)
J6
TC5(-) CH5 sensor input (–) TC21(-) CH21 sensor input (–)
TC6(+) CH6 sensor input (+)
J7
TC6(-) CH6 sensor input (–) TC22(-) CH22 sensor input (–)
TC7(+) CH7 sensor input (+)
J8
TC7(-) CH7 sensor input (–) TC23(-) CH23 sensor input (–)
TC8(+) CH8 sensor input (+)
J9
TC8(-) CH8 sensor input (–) TC24(-) CH24 sensor input (–)
TC9(+) CH9 sensor input (+)
J10
TC9(-) CH9 sensor input (–) TC25(-) CH25 sensor input (–)
TC10(+) CH10 sensor input (+)
J11
TC10(-) CH10 sensor input (–) TC26(-) CH26 sensor input (–)
TC11(+) CH11 sensor input (+)
J12
TC11(-) CH11 sensor input (–) TC27(-) CH27 sensor input (–)
TC12(+) CH12 sensor input (+)
J13
TC12(-) CH12 sensor input (–) TC28(-) CH28 sensor input (–)
TC13(+) CH13 sensor input (+)
J14
TC13(-) CH13 sensor input (–) TC29(-) CH29 sensor input (–)
TC14(+) CH14 sensor input (+)
J15
TC14(-) CH14 sensor input (–) TC30(-) CH30 sensor input (–)
TC15(+) CH15 sensor input (+)
J16
TC15(-) CH15 sensor input (–) TC31(-) CH31 sensor input (–)
J17
J18
J19
J20
J21
J22
J23
J24
J25
J26
J27
J28
J29
J30
J31
J32
TC16(+) CH16 sensor input (+)
TC17(+) CH17 sensor input (+)
TC18(+) CH18 sensor input (+)
TC19(+) CH19 sensor input (+)
TC20(+) CH20 sensor input (+)
TC21(+) CH21 sensor input (+)
TC22(+) CH22 sensor input (+)
TC23(+) CH23 sensor input (+)
TC24(+) CH24 sensor input (+)
TC25(+) CH25 sensor input (+)
TC26(+) CH26 sensor input (+)
TC27(+) CH27 sensor input (+)
TC28(+) CH28 sensor input (+)
TC29(+) CH29 sensor input (+)
TC30(+) CH30 sensor input (+)
TC31(+) CH31 sensor input (+)
25
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OMB-DAQ-TC-RACK User's Guide Specifications
Table 21. Digital I/O connector (J33) pinout
Pin Signal Name Pin Description Pin Signal Name Pin Description
1
DOUT0
3 DOUT2 Digital Output 2/ Alarm Output 2 4 DOUT3 Digital Output 3/ Alarm Output 3
5 DOUT4 Digital Output 4/ Alarm Output 4 6 DOUT5 Digital Output 5/ Alarm Output 5
7
DOUT6
9 DOUT8 Digital Output 8/ Alarm Output 8 10 DOUT9 Digital Output 9/ Alarm Output 9
11 DOUT10 Digital Output 10/ Alarm Output 10 12 DOUT11 Digital Output 11/ Alarm Output 11
13
DOUT12
15 DOUT14 Digital Output 14/ Alarm Output 14 16 DOUT15 Digital Output 15/ Alarm Output 15
17 IGND Isolated Digital GND 18 IGND Isolated Digital GND
19
IGND
21 DOUT16 Digital Output 16/ Alarm Output 16 22 DOUT17 Digital Output 17 / Alarm Output 17
23 DOUT18 Digital Output 18/ Alarm Output 18 24 DOUT19 Digital Output 19/ Alarm Output 19
25
DOUT20
27 DOUT22 Digital Output 22/ Alarm Output 22 28 DOUT23 Digital Output 23/ Alarm Output 23
29 DOUT24 Digital Output 24/ Alarm Output 24 30 DOUT25 Digital Output 25 / Alarm Output 25
31
DOUT26
33 DOUT28 Digital Output 28/ Alarm Output 28 34 DOUT29 Digital Output 29/ Alarm Output 29
35 DOUT30 Digital Output 30/ Alarm Output 30 36 DOUT31 Digital Output 31/ Alarm Output 31
37
IGND
39 IGND Isolated Digital GND 40 IGND Isolated Digital GND
41 DIN0 Digital Input 0 42 DIN1 Digital Input 1
43 DIN2 Digital Input 2 44 DIN3 Digital Input 3
45 DIN4 Digital Input 4 46 DIN5 Digital Input 5
47 DIN6 Digital Input 6 48 DIN7 Digital Input 7
49
IGND
Digital Output 0/ Alarm Output 0 2
Digital Output 6/ Alarm Output 6 8
Digital Output 12/ Alarm Output 12 14
Isolated Digital GND 20
Digital Output 20/ Alarm Output 20 26
Digital Output 26/ Alarm Output 26 32
Isolated Digital GND 38
Isolated Digital GND 50
DOUT1
DOUT7
DOUT13
IGND
DOUT21
DOUT27
IGND
IGND
Digital Output 1/ Alarm Output 1
Digital Output 7/ Alarm Output 7
Digital Output 13/ Alarm Output 13
Isolated Digital GND
Digital Output 21/ Alarm Output 21
Digital Output 27/ Alarm Output 27
Isolated Digital GND
Isolated Digital GND
Table 22. Expansion connector (J34) pinout
Pin Signal Name Pin Description Pin Signal Name Pin Description
1 +12VA (Note) +12 VA power output
3
+12VA
5 +5VA +5 VA power output 6 AGND Isolated Analog GND
7 +5VA +5 VA power output 8 AGND Isolated Analog GND
9
+5VA
11 +5VA +5 VA power output 12 AGND Isolated Analog GND
13 +3.3VA +3.3 VA power output 14 AGND Isolated Analog GND
15
+3.3VA
17 +3.3VA +3.3 VA power output 18 AGND Isolated Analog GND
19 +3.3VA +3.3 VA power output 20 AGND Isolated Analog GND
21
CS
23 SCK Serial clock 24 AGND Isolated Analog GND
25
MOSI
27 MISO Master input data 28 AGND Isolated Analog GND
29
IRQ
31 RSVD Reserved 32 AGND Isolated Analog GND
33
RSVD
35 RSVD Reserved 36 AGND Isolated Analog GND
37
RSVD
39 EXP_DETECT EXP detection 40 AGND Isolated Analog GND
+12 VA power output 4
+5 VA power output 10
+3.3 VA power output 16
Chip select 22
Master output data 26
Interrupt request 30
Reserved 34
Reserved 38
Note 8
2 AGND Isolated Analog GND
AGND
AGND
AGND
AGND
AGND
AGND
AGND
AGND
Isolated Analog GND
Isolated Analog GND
Isolated Analog GND
Isolated Analog GND
Isolated Analog GND
Isolated Analog GND
Isolated Analog GND
Isolated Analog GND
Note 8: Power supplies (+12 VA, +5 VA, 3.3 VA) located at connector J34 are intended for use with the
OMB-DAQ-TC-RACK-EXP32 expansion device only.
26
Page 27
WARRANTY/DISCLAIMER
OMEGA ENGINEERING, INC. warrants this unit to be free of defects in materials and workmanship for a
period of 13 months from date of purchase. OMEGA’s WARRANTY adds an additional one (1) month grace
period to the normal one (1) year product warranty to cover handling and shipping time. This ensures
that OMEGA’s customers receive maximum coverage on each product.
If the unit malfunctions, it must be returned to the factory for evaluation. OMEGA’s Customer Service
Department will issue an Authorized Return (AR) number immediately upon phone or written request.
Upon examination by OMEGA, if the unit is found to be defective, it will be repaired or replaced at no
charge. OMEGA’s WARRANTY does not apply to defects resulting from any action of the purchaser,
including but not limited to mishandling, improper interfacing, operation outside of design limits,
improper repair, or unauthorized modification. This WARRANTY is VOID if the unit shows evidence of
having been tampered with or shows evidence of having been damaged as a result of excessive corrosion;
or current, heat, moisture or vibration; improper specification; misapplication; misuse or other operating
conditions outside of OMEGA’s control. Components in which wear is not warranted, include but are not
limited to contact points, fuses, and triacs.
OMEGA is pleased to offer suggestions on the use of its various products. However,
OMEGA neither assumes responsibility for any omissions or errors nor assumes liability for
any damages that result from the use of its products in accordance with information provided
by OMEGA, either verbal or written. OMEGA warrants only that the parts manufactured by the
company will be as specified and free of defects. OMEGA MAKES NO OTHER WARRANTIES OR
REPRESENTATIONS OF ANY KIND WHATSOEVER, EXPRESSED OR IMPLIED, EXCEPT THAT OF
TITLE, AND ALL IMPLIED WARRANTIES INCLUDING ANY WARRANTY OF MERCHANTABILITY
AND FITNESS FOR A PARTICULAR PURPOSE ARE HEREBY DISCLAIMED. LIMITATION OF
LIABILITY: The remedies of purchaser set forth herein are exclusive, and the total liability of
OMEGA with respect to this order, whether based on contract, warranty, negligence,
indemnification, strict liability or otherwise, shall not exceed the purchase price of the
component upon which liability is based. In no event shall OMEGA be liable for
consequential, incidental or special damages.
CONDITIONS: Equipment sold by OMEGA is not intended to be used, nor shall it be used: (1) as a “Basic
Component” under 10 CFR 21 (NRC), used in or with any nuclear installation or activity; or (2) in medical
applications or used on humans. Should any Product(s) be used in or with any nuclear installation or
activity, medical application, used on humans, or misused in any way, OMEGA assumes no responsibility
as set forth in our basic WARRANTY/DISCLAIMER language, and, additionally, purchaser will indemnify
OMEGA and hold OMEGA harmless from any liability or damage whatsoever arising out of the use of the
Product(s) in such a manner.
RETURN REQUESTS/INQUIRIES
Direct all warranty and repair requests/inquiries to the OMEGA Customer Service Department. BEFORE
RETURNING ANY PRODUCT(S) TO OMEGA, PURCHASER MUST OBTAIN AN AUTHORIZED RETURN (AR)
NUMBER FROM OMEGA’S CUSTOMER SERVICE DEPARTMENT (IN ORDER TO AVOID PROCESSING
DELAYS). The assigned AR number should then be marked on the outside of the return package and on any
correspondence.
The purchaser is responsible for shipping charges, freight, insurance and proper packaging to prevent
breakage in transit.
FOR WARRANTY RETURNS, please have the
following information available BEFORE contacting
OMEGA:
1. Purchase Order number under which the product
was PURCHASED,
2. Model and serial number of the product under
warranty, and
3. Repair instructions and/or specific problems
relative to the product.
OMEGA’s policy is to make running changes, not model changes, whenever an improvement is possible. This affords our
customers the latest in technology and engineering.
OMEGA is a registered trademark of OMEGA ENGINEERING, INC.
© Copyright 2016 OMEGA ENGINEERING, INC. All rights reserved. This document may not be copied, photocopied,
reproduced, translated, or reduced to any electronic medium or machine-readable form, in whole or in part, without the prior
written consent of OMEGA ENGINEERING, INC.
FOR NON-WARRANTY REPAIRS, consult
OMEGA for current repair charges. Have
the following information available BEFORE
contacting OMEGA:
1. Purchase Order number to cover the COST
of the repair,
2. Model and serial number of the product, and
3. Repair instructions and/or specific problems
relative to the product.
Page 28
Where Do I Find Everything I Need for
Process Measurement and Control?
OMEGA…Of Course!
Shop online at omega.com
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